UFGS 23 09 23.13 20 BACnet Direct Digital Control · PDF fileDIRECT DIGITAL CONTROL SYSTEMS FOR HVAC . PART 1 ... Valves - Flanged, Threaded and Welding End ASME B16.5 ... Control

SECTION 23 09 23 DIRECT DIGITAL CONTROL SYSTEMS FOR HVAC

PART 1 - GENERAL

1.1 REFERENCES

A. The publications listed below form a part of this specification to the extent referenced. The publications are referred to in the text by the basic designation only.

AIR MOVEMENT AND CONTROL ASSOCIATION INTERNATIONAL (AMCA)

AMCA 500-D (2007) Laboratory Methods of Testing Dampers for Rating

AMERICAN SOCIETY OF HEATING, REFRIGERATING AND AIR-CONDITIONING ENGINEERS (ASHRAE)

ASHRAE 90.1 ASHRAE 135

(2007) Energy Standard for Buildings Except Low-Rise Residential Buildings (2010; INT 1-3 2011; Addenda AD & AE 2011; Errata 2012) BACnet—A Data Communication Protocol for Building Automation and Control Networks

ARCNET TRADE ASSOCIATION (ATA)

ATA 878.1 (1999) Local Area Network: Token Bus

ASME INTERNATIONAL (ASME)

ASME B16.18 (2012) Cast Copper Alloy Solder Joint Pressure Fittings

ASME B16.22 (2001; R 2010) Standard for Wrought Copper and Copper Alloy Solder Joint Pressure Fittings

ASME B16.26 (2011) Standard for Cast Copper Alloy Fittings for Flared Copper Tubes

ASME B16.34 (2009; Supp 2010) Valves - Flanged, Threaded and Welding End

ASME B16.5 (2009) Pipe Flanges and Flanged Fittings: NPS 1/2 Through NPS 24 Metric/Inch Standard

ASME B31.1 (2010) Power Piping

ASME B40.100 (2005; R 2010) Pressure Gauges and Gauge Attachments

ASME BPVC (2010) Boiler and Pressure Vessels Code ASTM INTERNATIONAL (ASTM)

ASTM A126 (2004; R 2009) Standard Specification for Gray Iron Castings for Valves, Flanges, and Pipe Fittings

ASTM B117 (2011) Standard Practice for Operating Salt Spray (Fog) Apparatus

ASTM B32 (2008) Standard Specification for Solder Metal

ASTM B75 (2002; R 2010) Standard Specification for Seamless Copper Tube

ASTM B88 (2009) Standard Specification for Seamless Copper Water Tube

ASTM B88M (2005; R 2011) Standard Specification for Seamless Copper Water Tube (Metric)

ASTM D1238 (2010) Melt Flow Rates of Thermoplastics by Extrusion Plastometer

ASTM D1693 (2008) Standard Test Method for Environmental Stress-Cracking of Ethylene Plastics

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23 09 23 - DIRECT DIGITAL CONTROL SYSTEMS FOR HVAC

ASTM D635 (2010) Standard Test Method for Rate of Burning and/or Extent and Time of Burning of Self-Supporting Plastics in a Horizontal Position

ASTM D638 (2010) Standard Test Method for Tensile Properties of Plastics

ASTM D792 (2008) Density and Specific Gravity (Relative Density) of Plastics by Displacement

CONSUMER ELECTRONICS ASSOCIATION (CEA)

CEA-709.1-C (2010) Control Network Protocol Specification

INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS (IEEE)

IEEE C57.13 (2008) Standard Requirements for Instrument Transformers

IEEE C62.41.1 (2002; R 2008) Guide on the Surges Environment in Low-Voltage (1000 V and Less) AC Power Circuits

IEEE C62.41.2 (2002) Recommended Practice on Characterization of Surges in Low-Voltage (1000 V and Less) AC Power Circuits

IEEE C62.45 (2002; R 2008) Recommended Practice on Surge Testing for Equipment Connected to Low-Voltage (1000v and less)AC Power Circuits

INTERNATIONAL ORGANIZATION FOR STANDARDIZATION (ISO)

ISO 8802-3 (2000) Information Technology - Telecommunications and Information Exchange Between Systems - Local and Metropolitan Area Networks - Specific Requirements - Part 3: Carrier Sense Multiple Access with Collision Detection (CSMA/CD)Access Method and Physical Layer Specifications

NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)

NEMA/ANSI C12.10

(2011) Physical Aspects of Watthour Meters- Safety Standards

NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)

NFPA 70 (2011; Errata 2 2012) National Electrical Code

NFPA 72 (2010; TIA 10-4) National Fire Alarm and Signaling Code

NFPA 90A (2012) Standard for the Installation of Air Conditioning and Ventilating Systems

SHEET METAL AND AIR CONDITIONING CONTRACTORS' NATIONAL ASSOCIATION (SMACNA)

SMACNA 1966 (2005) HVAC Duct Construction Standards Metal and Flexible, 3rd Edition

UNDERWRITERS LABORATORIES (UL)

UL 1449 (2006; Reprint Feb 2011) Surge Protective Devices

UL 506 (2008; Reprint Mar 2010) Specialty Transformers

UL 508A (2001; Reprint Feb 2010) Industrial Control Panels

UL 916 (2007; Reprint Jun 2010) Standard for Energy Management Equipment

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1.2 DEFINITIONS

A. ANSI/ASHRAE Standard 135

1. ANSI/ASHRAE Standard 135: BACnet - A Data Communication Protocol for Building Automation and Control Networks, referred to as "BACnet". ASHRAE developed BACnet to provide a method for diverse building automation devices to communicate and share data over a network.

B. ARCNET

1. ATA 878.1 - Attached Resource Computer Network. ARCNET is a deterministic LAN technology; meaning it's possible to determine the maximum delay before a device is able to transmit a message.

C. BACnet

1. Building Automation and Control Network; the common name for the communication standard ASHRAE 135. The standard defines methods and protocol for cooperating building automation devices to communicate over a variety of LAN technologies.

D. BACnet/IP

1. An extension of BACnet, Annex J, defines this mechanism using a reserved UDP socket to transmit BACnet messages over IP networks. A BACnet/IP network is a collection of one or more IP subnetworks that share the same BACnet network number. See also "BACnet Broadcast Management Device".

E. BACnet Internetwork

1. Two or more BACnet networks, possibly using different LAN technologies, connected with routers. In a BACnet internetwork, there exists only one message path between devices.

F. BACnet Network

1. One or more BACnet segments that have the same network address and are interconnected by bridges at the physical and data link layers.

G. BACnet Segment

1. One or more physical segments of BACnet devices on a BACnet network, connected at the physical layer by repeaters.

H. BBMD

1. BACnet Broadcast Management Device (BBMD). A communications device typically combined with a BACnet router. A BBMD forwards BACnet broadcast messages to BACnet/IP devices and other BBMDs connected to the same BACnet/IP network. Every IP subnetwork that is part of a BACnet/IP network must have only one BBMD. See also "BACnet/IP".

I. BIBBs

1. BACnet Interoperability Building Blocks. A collection of BACnet services used to describe supported tasks. BIBBs are often described in terms of "A" (client) and "B"

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(server) devices. The “A” device uses data provided by the "B" device, or requests an action from the “B” device.

J. BI

1. BACnet International, formerly two organizations: the BACnet Manufacturers Association (BMA) and the BACnet Interest Group - North America (BIG-NA).

K. BI/BTL

1. BACnet International/BACnet Testing Laboratories (Formerly BMA/BTL). The organization responsible for testing products for compliance with the BACnet standard, operated under the direction of BACnet International.

L. Bridge

1. Network hardware that connects two or more network (or BACnet internetwork) segments at the physical and data link layers. A bridge may also filter messages.

M. Broadcast

1. A message sent to all devices on a network segment.

N. Device

1. Any control system component, usually a digital controller that contains a BACnet Device Object and uses BACnet to communicate with other devices. See also "Digital Controller".

O. Device Object

1. Every BACnet device requires one Device Object, whose properties represent the network visible properties of that device.

2. Every Device Object requires a unique Object Identifier number on the BACnet internetwork. This number is often referred to as the device instance.

P. Device Profile

1. A collection of BIBBs determining minimum BACnet capabilities of a device, defined in ASHRAE Standard 135-2004, Annex L.

2. Standard device profiles include BACnet Operator Workstations (B-OWS), BACnet Building Controllers (B-BC), BACnet Advanced Application Controllers (B-AAC), BACnet Application Specific Controllers (B-ASC), BACnet Smart Actuator (B-SA), and BACnet Smart Sensor (B-SS).

3. Each device used in new construction is required to have a PICS statement listing BIBBs supported.

Q. Digital Controller

1. An electronic controller, usually with internal programming logic and digital and analog input/output capability, which performs control functions. In most cases, synonymous with a BACnet device described in this specification.

2. See also "Device".

R. Direct Digital Control (DDC)

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1. Digital controllers performing control logic. 2. Usually the controller directly senses physical values, makes control decisions with

internal programs, and outputs control signals to directly operate switches, valves, dampers, and motor controllers.

S. DDC System

1. A network of digital controllers, communication architecture, and user interfaces. A DDC system may include programming, sensors, actuators, switches, relays, factory controls, operator workstations, and various other devices, components, and attributes.

T. Ethernet

1. A family of local-area-network technologies providing high-speed networking features over various media.

U. Firmware

1. Software programmed into read only memory (ROM), flash memory, electrically erasable programmable read only memory (EEPROM), or erasable programmable read only memory (EPROM) chips.

V. Gateway

1. Communication hardware connecting two or more different protocols, similar to human language translators.

2. The Gateway translates one protocol into equivalent concepts for the other protocol. 3. In BACnet applications, a gateway has BACnet on one side and non-BACnet (usually

proprietary) protocols on the other side.

W. Half Router

1. A device that participates as one partner in a BACnet point-to-point (PTP) connection. 2. Two half-routers in an active PTP connection combine to form a single router.

X. Hub

1. A common connection point for devices on a network.

Y. Internet Protocol (IP, TCP/IP, UDP/IP)

1. A communication method, the most common use is the World Wide Web. 2. At the lowest level, it is based on Internet Protocol (IP), a method for conveying and

routing packets of information over various LAN media. 3. Two common protocols using IP are User Datagram Protocol (UDP) and Transmission

Control Protocol (TCP). UDP conveys information to well-known "sockets" without confirmation of receipt. TCP establishes "sessions", which have end-to-end confirmation and guaranteed sequence of delivery.

Z. Input/Output (I/O)

1. Physical inputs and outputs to and from a device, although the term sometimes describes software, or "virtual" I/O. See also "Points".

AA. I/O Expansion Unit

1. An I/O expansion unit provides additional point capacity to a digital controller.

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BB. IP subnet

1. Internet protocol (IP) identifies individual devices with a 32-bit number divided into four groups from 0 to 255.

2. Devices are often grouped and share some portion of this number. For example, one device has IP address 209.185.47.68 and another device has IP address 209.185.47.82. These two devices share Class C subnet 209.185.47.00

CC. Local-Area Network (LAN)

1. A communication network that spans a limited geographic area and uses the same basic communication technology throughout.

DD. LonTalk

1. CEA-709.1-C. A communication protocol developed by Echelon Corp. LonTalk is an optional physical and data link layer for BACnet.

EE. MAC Address

1. Media Access Control address. 2. The physical node address that identifies a device on a Local Area Network.

FF. Master-Slave/Token-Passing (MS/TP)

1. ISO 8802-3. One of the LAN options for BACnet. 2. MSTP uses twisted-pair wiring for relatively low speed and low cost communication (up

to 4,000 ft at 76.8K bps).

GG. Native BACnet Device

1. A device that uses BACnet as its primary, if not only, method of communication with other BACnet devices without intermediary gateways.

2. A system that uses native BACnet devices at all levels is a native BACnet system.

HH. Network

1. Communication technology for data communications. BACnet approved network types are BACnet over Internet Protocol (IP), Point to Point (PTP) Ethernet, ARCNET, MS/TP, and LonTalk®.

II. Network Number

1. A site-specific number assigned to each network segment to identify for routing. 2. This network number must be unique throughout the BACnet internetwork.

JJ. Object

1. The concept of organizing BACnet information into standard components with various associated properties. Examples include analog input objects and binary output objects.

KK. Object Identifier

1. An object property used to identify the object, including object type and instance. Object Identifiers must be unique within a device.

LL. Object Properties

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1. Attributes of an object. Examples include present value and high limit properties of an analog input object.

2. Properties are defined in ASHRAE 135; some are optional and some are required. Objects are controlled by reading from and writing to object properties.

MM. OSFC

1. Ohio School Facilities Commission

NN. Owner

1. Owner - Willard School District, Co-Owner – Ohio School Facilities Commission

OO. Peer-to-Peer

1. Peer-to-peer refers to devices where any device can initiate and respond to communication with other devices.

PP. Performance Verification Test (PVT)

1. The procedure for determining if the installed system meets design criteria prior to final acceptance. The PVT is performed after installation, testing, and balancing of mechanical systems. Typically the PVT is performed by the Contractor in the presence of the Engineer.

QQ. PID

1. Proportional, integral, and derivative control; three parameters used to control modulating equipment to maintain a setpoint. Derivative control is often not required for HVAC systems (leaving "PI" control).

RR. PICS

1. Protocol Implementation Conformance Statement (PICS), describing the BACnet capabilities of a device. See BACnet, Annex A for the standard format and content of a PICS statement.

SS. Points

1. Physical and virtual inputs and outputs. See also "Input/Output".

TT. PTP

1. Point-to-Point protocol connects individual BACnet devices or networks using serial connections like modem-to-modem links.

UU. PVT

1. Performance Verification Testing

VV. Repeater

1. A network component that connects two or more physical segments at the physical layer.

WW. Router

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1. A BACnet router is a component that joins together two or more networks using different LAN technologies. Examples include joining a BACnet Ethernet LAN to a BACnet MS/TP LAN.

XX. Stand-Alone Control

1. Refers to devices performing equipment-specific and small system control without communication to other devices or computers for physical I/O, excluding outside air and other common shared conditions.

2. Devices are located near controlled equipment, with physical input and output points limited to 64 or less per device, except for complex individual equipment or systems.

3. Failure of any single device will not cause other network devices to fail. 4. BACnet "Smart" actuators (B-SA profile) and sensors (B-SS profile) communicating on a

network with a parent device are exempt from stand-alone requirements.

1.3 BACnet DIRECT DIGITAL CONTROL SYSTEMS FOR HVAC DESCRIPTION

Design Requirements

A. Control System Drawings Title Sheet

1. Provide a title sheet for the control system drawing set. 2. Include the project title, project location, contract number, the controls contractor

preparing the drawings, an index of the control drawings in the set, and a legend of the symbols and abbreviations used throughout the control system drawings.

B. List of I/O Points

1. Also known as a Point Schedule, provide for each input and output point physically connected to a digital controller:

a. Point name, Point description, Point type (Analog Output (AO), Analog Input (AI), Binary Output (BO), Binary Input (BI)), point sensor range, point actuator range, point address, BACnet object, associated BIBBS (where applicable), and point connection terminal number.

b. Typical schedules for multiple identical equipment are allowed unless otherwise requested in design or contract criteria.

C. Control System Components List

1. Provide a complete list of control system components installed on this project.

a. Include for each controller and device: control system schematic name, control system schematic designation, device description, manufacturer, and manufacturer part number.

b. For sensors, include point name, sensor range, and operating limits. c. For valves, include body style, Cv, design flow rate, pressure drop, valve

characteristic (linear or equal percentage), and pipe connection size. d. For actuators, include point name, spring or non-spring return, modulating or two-

position action, normal (power fail) position, nominal control signal operating range (0-10 volts DC or 4-20 milliamps), and operating limits.

D. Control System Schematics

1. Provide control system schematics.

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2. Typical schematics for multiple identical equipment are allowed unless otherwise requested in design or contract criteria. Include the following:

a. Location of each input and output device b. Flow diagram for each piece of HVAC equipment c. Name or symbol for each control system component, such as V-1 for a valve d. Setpoints, with differential or proportional band values e. Written sequence of operation for the HVAC equipment f. Valve and Damper Schedules, with normal (power fail) position

E. HVAC Equipment Electrical Ladder Diagrams

1. Provide HVAC equipment electrical ladder diagrams. Indicate required electrical interlocks.

F. Component Wiring Diagrams

1. Provide a wiring diagram for each type of input device and output device. Indicate how each device is wired and powered; showing typical connections at the digital controller and power supply. Show for all field connected devices such as control relays, motor starters, actuators, sensors, and transmitters.

G. Terminal Strip Diagrams

1. Provide a diagram of each terminal strip. Indicate the terminal strip location, termination numbers, and associated point names.

H. BACnet Communication Architecture Schematic

1. Provide a schematic showing the project's entire BACnet communication network, including addressing used for LANs, LAN devices including routers and bridges, gateways, controllers, workstations, and field interface devices. If applicable, show connection to existing networks.

I. SUBMITTALS

1. Submit detailed and annotated manufacturer's data, drawings, and specification sheets for each item listed, that clearly show compliance with the project specifications.

2. Shop Drawings Include the following in the project's control system drawing set:

a. Control system drawings title sheet b. List of I/O Points c. Control System Components List d. Control system schematics e. HVAC Equipment Electrical Ladder diagrams f. Component wiring diagrams g. Terminal strip diagrams h. BACnet communication architecture schematic i. Sequence of Operation j. Detailed description describing how chiller condenser water supply temperature is

calculated. See Chiller sequence of operation in Specification 230993 Sequence of operations for HVAC Controls.

3. Product Data

a. Direct Digital Controllers

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1) Include BACnet PICS for each controller/device type, including smart sensors (B-SS) and smart actuators (B-SA).

b. BACnet Gateways

1) Include BACnet and workstation display information; bi-directional communication ability; compliance with interoperability schedule; expansion capacity; handling of alarms, events, scheduling and trend data; and single device capability (not depending on multiple devices for exchanging information from either side of the gateway).

c. BACnet Protocol Analyzer

1) Include capability to store and report data traffic on BACnet networks, measure bandwidth usage, filter information, and identify BACnet devices.

d. DDC Software e. BACnet Operator Workstation DDC Software

1) Include BACnet PICS for Operator Workstation software.

f. Notebook Computer with appropriate software for Maintenance Department g. Sensors and Input Hardware h. Output Hardware i. Surge and transient protection j. Indicators k. Design Data l. Performance Verification Testing Plan m. Pre-Performance Verification Testing Checklist - Test Reports n. Performance Verification Testing Report - Certificates o. Contractor's Qualifications p. Manufacturer's Field Reports q. Pre-PVT Checklist r. Operation and Maintenance Data s. Controls System Operators Manuals t. Closeout Submittals u. Training documentation

1.4 QUALITY ASSURANCE

A. If anything listed herein cannot be met, then all exceptions taken are to be included with the bid.

B. Provide with bid, detailed description describing how chiller condenser water supply temperature is calculated. See Chiller sequence of operation in Specification 230993 Sequence of operations for HVAC Controls.

C. Provide with bid any and all licensing requirements.

D. Pre-Submittal Meeting

1. DDC System contractor shall convene a pre-submittal meeting with the engineer, commissioning agent and owner within one month of the notice to proceed. The purpose of this meeting is to review the sequences of operation, outline where the proposed system deviates from the specified sequence of operation, and identify potential problems with the specified sequence. Once the sequences of operation are

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agreed to by all parties, the contractor shall proceed with the formal controls submittal process. DDC System contractor shall submit a print out of all graphics proposed for the project within one month following submittal approval for review jointly by the owner, engineer, and commissioning agent. DDC System Contractor will be required to demonstrate the prescribed operations while in the Owners office. The Owner, Engineer, Construction Manager, Commissioning Agent and Mechanical Contractor may be present to observe and evaluate the demonstration. In order to meet the specification and be considered acceptable they must meet these requirements.

2. The following items will be reviewed during the demonstration:

a. Access to the system through a standard web browser, Internet Explorer. b. Ease-of-use of the system relating to:

1) Changing Schedules 2) Changing Set Points 3) Modifying Program Logic 4) Modifying Graphics 5) Reviewing Historical Trends 6) Downloading Controllers 7) Review Activity Log 8) Review / Edit / Acknowledge Alarms 9) Programming remote alarms to cell phones and email

E. Standard Products

1. Provide material and equipment that are standard manufacturer's products currently in production and supported by a local service organization.

F. Delivery, Storage, and Handling

1. Handle, store, and protect equipment and materials to prevent damage before and during installation according to manufacturer's recommendations.

2. Replace damaged or defective items.

G. Operating Environment

1. Protect components from humidity and temperature variation, dust, and contaminants. 2. If components are stored before installation, keep them within the manufacturer's limits.

H. Finish of New Equipment

1. New equipment finishing shall be factory provided. 2. Manufacturer's standard factory finishing shall be proven to withstand 125 hours in a

salt-spray fog test.

a. Equipment located outdoors shall be proven to withstand 500 hours in a salt-spray fog test.

b. Salt-spray fog test shall be according to ASTM B117, with acceptance criteria as follows: immediately after completion of the test, the finish shall show no signs of degradation or loss of adhesion beyond 3.175 mm 0.125 inch on either side of the scratch mark.

I. Verification of Dimensions

1. The contractor shall verify all dimensions in the field, and advise the Construction Manager of any discrepancy before performing work.

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J. Contractor's Qualifications

1. Submit documentation certifying the controls Contractor performing the work has completed at least three DDC systems installations of a similar design to this project, and programmed similar sequences of operation for at least two years.

2. All bidders must have a minimum of three (3), installed, web-based systems. Systems must be accessible via the Internet from the Owners office and shall be able to demonstrate these systems, prior to award of contract, using only an Owner provided web browser.

K. Project Sequence - The control system work for this project shall proceed in the following order:

1. Submit and receive approval on the Shop Drawings, Product Data, and Certificates specified under the paragraph entitled "SUBMITTALS."

2. Perform the control system installation work, including all field check-outs and tuning.

3. Provide support to TAB personnel as specified under the paragraph "TEST AND BALANCE SUPPORT."

4. Provide support to Commissioning Agent.

5. Submit and receive approval of the Controls System Operators Manual specified under the paragraph "CONTROLS SYSTEM OPERATORS MANUALS."

6. Submit and receive approval of the Performance Verification Testing Plan and the Pre-PVT Checklist specified under the paragraph "PERFORMANCE VERIFICATION TESTING."

7. Perform the Performance Verification Testing.

8. Submit and receive approval on the PVT Report.

9. Provide one year trend data

10. Submit and receive approval on the Training Documentation at least 30 days before training.

11. Deliver the final Controls System Operators Manuals.

12. Conduct the Phase I Training.

13. Conduct the Phase II Training.

14. Submit and receive approval of Closeout Submittals

L. COORDINATION

1. Coordinate location of thermostats, room humidity sensors, CO2 sensors, and other exposed control sensors with plans and room details before installation.

2. Coordinate equipment with Division 28 Section "Fire Alarm System" to achieve compatibility with equipment that interfaces with that system.

3. Coordinate equipment with Division 26 Section "Panelboards" to achieve compatibility with starter coils and annunciation devices.

4. Coordinate equipment with Division 26 Section “Lighting Controls” to achieve compatibility with lighting control system.

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M. Control systems shall meet the requirements of ASHRAE Standard 90.1.

1.5 WARRANTY

A. One (1) year manufacturer's warranty on all DDC control system components from universal warranty start date defined in front end documents.

PART 2 - PRODUCTS

2.1 DDC SYSTEM

A. Provide a networked DDC system for stand-alone control in compliance with the latest revision of the ASHRAE 135 BACnet standard. Include all programming, objects, and services required to meet the sequence of control. Provide BACnet communications between the DDC system and native BACnet devices furnished with HVAC equipment [and plant equipment including boilers, chillers, and variable frequency drives]. Devices provided shall be certified in the BACnet Testing Laboratories (BTL) Product Listing.

B. Provide an operator workstation software on a computer (furnished under technology) with complete interface software capable of programming, configuring, and monitoring the digital controllers. All software and licenses necessary to make changes or expand the system must be included.

C. No Mercury Containing Devices

D. All Direct Digital Controllers, except Cabinet Unit Heater Direct Digital Controllers, are to be fully software programmable. That is programming utilizing DIP switches to access standard control sequences built into the controller are not allowed. Note: this includes VAV Box controllers.

E. The DDC Operator Workstation software shall be BACnet compliant per BACnet Testing Laboratory

2.2 BACNET CONFORMANCE

A. The DDC System Contractor shall supply a BACnet (ANSI/ASHRAE 135-2010) compliant system. BACnet compatible systems that employ the use of proprietary ‘gateways’ will not be accepted. All DDC System Contractors shall supply, prior to bid, Protocol Implementation Conformance Statements (PICS) and BACnet Interoperability Building Block (BIBB) summaries to the Associate Engineer for final approval.

B. The BACnet system shall be capable of Internet Protocol (IP) communications. BACnet/IP and BACnet MS/TP will be considered the basis of design. All other configurations must be submitted prior to bid, in writing, for final approval.

C. The secondary or sub-network shall utilize the Master-Slave/Token-Passing protocol, as acknowledged by the ANSI/ASHRAE 135 standard. Proprietary RS-485 or equivalent links will not be considered. The MS/TP link shall operate at a 76.8 Kbps minimum, and utilize no more than 2 repeaters in any instance.

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2.3 DIGITAL CONTROLLER BACNET INTERNETWORK

A. Provide a BACnet internetwork with control products, communication media, connectors, repeaters, hubs, and routers. Controller and operator interface communication shall conform to ASHRAE 135, BACnet. If a controller becomes non-responsive, the remaining controllers shall continue operating and not be affected by the failed controller.

1. Communications Ports

a. Direct-Connect Interface Ports: Provide at least one extra communication port at each local BACnet network for direct connecting a notebook computer or BACnet hand-held terminal so all network BACnet objects and properties may be viewed and edited by the operator.

2. BACnet Communications to Plant Equipment

a. Provide BACnet communication ports, whenever available as a plant equipment OEM standard option (unless noted otherwise that allow hard wired points instead of BACnet communication, such as for the VFD’s), for DDC integration via a single communication cable. Typical BACnet controlled plant equipment includes, but is not limited to, boilers, chillers, and variable frequency motor drives. Gateways are not allowed, unless required for communicating to equipment utilizing MODbus.

2.4 MANUFACTURERS

A. In other Part 2 articles where titles below introduce lists, the following requirements apply to product selection:

1. Manufacturers: Subject to compliance with requirements, provide products by one of the manufacturers specified.

2. Alternate manufacturers for design basis products must request and obtain written approval by the Engineer to bid the project at least 7 days prior to the bid due-date. Alternate manufacturer must submit documentation meeting all of the characteristics called for the product.

2.5 CONTROL SYSTEM

A. Vendors (in alphabetical order) – See Front End Section “Instructions to Bidders” for detailed information.

1. Automated Logic

B. Control system shall consist of sensors, indicators, actuators, final control elements, interface equipment, other apparatus, and accessories to control mechanical systems.

C. Control system shall consist of sensors, indicators, actuators, final control elements, interface equipment, other apparatus, accessories, and software connected to distributed controllers operating in multiuser, multitasking environment on token-passing network and programmed to control mechanical systems. An operator workstation permits interface with the network via dynamic color graphics with each mechanical system, building floor plan, and control device depicted by point-and-click graphics.

D. All temperature control wiring shall be provided for a complete and operable system. All wiring shall be installed in accordance with Division 26, NEC and all local Codes.

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E. The Controls Contractor will be responsible for all system graphics software, graphic creation, alarming as specified, scheduling as specified and, shall train the Owner on how to set-up alarms, trending and scheduling.

F. Control systems shall meet the requirements of ASHRAE Standard 90.1.

G. Direct Digital Controllers

1. Direct digital controllers shall be UL 916 rated.

H. I/O Point Limitation

1. The total number of I/O hardware points used by a single stand-alone digital controller, including I/O expansion units, shall not exceed 64, except for complex individual equipment or systems.

2. Place I/O expansion units in the same cabinet as the digital controller.

I. Environmental Limits

1. Controllers shall be suitable for, or placed in protective enclosures suitable for the environment (temperature, humidity, dust, and vibration) where they are located.

J. Stand-Alone Control

1. Provide stand-alone digital controllers.

K. Internal Clock

1. Provide internal clocks for all BACnet Building Controllers (B-BC) and BACnet Advanced Application Controllers (B-AAC) using BACnet time synchronization services.

a. Automatically synchronize system clocks daily from an operator-designated controller.

b. The system shall automatically adjust for daylight saving time.

L. Memory

1. Provide sufficient memory for each controller to support the required control, communication, trends, alarms, and messages.

a. Protect programs residing in memory with EEPROM, flash memory, or by an uninterruptible power source (battery or uninterruptible power supply).

b. The backup power source shall have capacity to maintain the memory during a 72-hour continuous power outage.

c. Rechargeable power sources shall be constantly charged while the controller is operating under normal line power. Batteries shall be replaceable without soldering.

d. Trend and alarm history collected during normal operation shall not be lost during power outages less than 72 hours long.

M. Immunity to Power Fluctuations

1. Controllers shall operate at 90 percent to 110 percent nominal voltage rating.

N. Transformer

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1. The controller power supply shall be fused or current limiting and rated at 125 percent power consumption.

O. Wiring Terminations

1. Use screw terminal wiring terminations for all field-installed controllers.

a. Provide field-removable modular terminal strip or a termination card connected by a ribbon cable for all controllers other than terminal units.

P. Input and Output Interface

1. Provide hard-wired input and output interface for all controllers as follows:

a. Protection: Shorting an input or output point to itself, to another point, or to ground shall cause no controller damage. Input or output point contact with sources up to 24 volts AC or DC for any duration shall cause no controller damage.

b. Binary Inputs: Binary inputs shall monitor on and off contacts from a "dry" remote device without external power, and external 5-24 VDC voltage inputs.

c. Pulse Accumulation Inputs: Pulse accumulation inputs shall conform to binary input requirements and accumulate pulses at a resolution suitable to the application.

d. Analog Inputs: Analog inputs shall monitor low-voltage (0-10 VDC), current (4-20 mA), or resistance (thermistor or RTD) signals.

e. Binary Outputs: Binary outputs shall send a pulsed 24 VDC low-voltage signal for modulation control, or provide a maintained open-closed position for on-off control.

f. Analog Outputs: Analog outputs shall send modulating 0-10 VDC or 4-20 mA signals to control output devices.

g. Tri-State Outputs: Tri-State outputs shall provide three-point floating control of terminal unit electronic actuators.

Q. Digital Controller BACnet Internetwork

1. Provide a BACnet internetwork with control products, communication media, connectors, repeaters, hubs, and routers.

2. Provide intermediate gateways, only when requested by the Engineer and shown on the contract drawings, to connect existing non-BACnet devices to the BACnet internetwork. Controller and operator interface communication shall conform to ASHRAE 135, BACnet. If a controller becomes non-responsive, the remaining controllers shall continue operating and not be affected by the failed controller.

R. Communications Ports

1. Direct-Connect Interface Ports:

a. Provide at least one extra communication port at each local BACnet network for direct connecting a notebook computer or BACnet hand-held terminal so all network BACnet objects and properties may be viewed and edited by the operator.

2. Telecommunications Interface Port:

a. Provide telephone communication port so that DDC System can send alarms to cell phones.

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S. BACnet Gateways

1. Provide BACnet communication ports, whenever available as a plant equipment OEM standard option, for DDC integration via a single communication cable. Typical BACnet controlled plant equipment includes, but is not limited to, boilers, chillers, and variable frequency motor drives.

2. Provide gateways only when specifically requested and approved by the Engineer, and shown on the Engineer approved BACnet Communication Architecture Schematic.

3. Provide with each gateway an interoperability schedule [Use gateway interoperability schedules shown on design drawings or other project documents], showing each point or event on the legacy side that the BACnet "client" will read, and each parameter that the BACnet network will write to.

4. Describe this interoperability in terms of BACnet services, or Interoperability Building Blocks (BIBBS), defined in ASHRAE 135 Annex K. Provide two-year minimum warranty for each gateway, including parts and labor.

5. The following minimum capabilities are required:

a. Gateways shall be able to read and view all readable object properties listed in the interoperability schedule on the non-BACnet network to the BACnet network and vice versa where applicable.

b. Gateways shall be able to write to all writeable object properties listed in the interoperability schedule on the non-BACnet network from the BACnet network and vice versa where applicable.

c. Gateways shall provide single-pass (only one protocol to BACnet without intermediary protocols) translation from the non-BACnet protocol to BACnet and vice versa.

d. Gateways shall meet the requirements of Data Sharing Read Property (DS-RP-B), Data Sharing Write Property (DS-WP-B), Device Management Dynamic Device Binding-B (DM-DDB-B), and Device Management Communication Control (DM-DCC-B) BIBBs, in accordance with ASHRAE 135.

e. Gateways shall include all hardware, software, software licenses, and configuration tools for operator-to-gateway communications.

6. Provide backup programming and parameters on CD media and the ability to modify, download, backup, and restore gateway configuration.

T. Digital Controller Cabinet

1. Provide each digital controller in a factory fabricated cabinet enclosure.

a. Cabinets located indoors shall protect against dust and have a minimum NEMA 1 rating, except where indicated otherwise.

b. Cabinets located outdoors or in damp environments shall protect against all outdoor conditions and have a minimum NEMA 4 rating.

2. Outdoor control panels and controllers must be able to withstand extreme ambient conditions, without malfunction or failure, whether or not the controlled equipment is running.

3. If necessary, provide a thermostatically controlled panel heater in freezing locations, and an internal ventilating fan in locations exposed to direct sunlight. Cabinets shall have a hinged lockable door and an offset removable metal back plate, except controllers integral with terminal units, like those mounted on VAV boxes.

4. Provide like-keyed locks for all hinged panels provided and a set of two keys at each panel, with one key inserted in the lock.

U. Main Power Switch and Receptacle

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1. Provide each control cabinet with a main external power on/off switch located inside the cabinet.

2. Also provide each cabinet with a separate 120 VAC duplex receptacle.

2.6 DDC Software

A. Programming

1. Provide programming to execute the sequence of operation indicated. Provide all programming and tools to configure and program all controllers.

2. Provide programming routines in simple, easy-to-follow logic with detailed text comments describing what the logic does and how it corresponds to the project's written sequence of operation.

a. Graphic-based programming shall use a library of function blocks made from pre-programmed code designed for DDC SYSTEM control. Function blocks shall be assembled with interconnecting lines, depicting the control sequence in a flowchart. If providing a computer with device programming tools as part of the project, graphic programs shall be viewable in real time showing present values and logical results from each function block.

b. Menu-based programming shall be done by entering parameters, definitions, conditions, requirements, and constraints.

c. For line-by-line and text-based programming, declare variable types (local, global, real, integer, etc.) at the beginning of the program. Use descriptive comments frequently to describe the programming.

d. If providing a computer with device programming tools as part of the project, provide a means for detecting program errors and testing software strategies with a simulation tool.

3. Simulation may be inherent within the programming software suite, or provided by physical controllers mounted in a NEMA 1 test enclosure.

4. The test enclosure shall contain one dedicated controller of each type provided under this contract, complete with power supply and relevant accessories.

B. Parameter Modification

1. All writeable object properties, and all other programming parameters needed to comply with the project specification shall be adjustable for devices at any network level, including those accessible with web-browser communication, and regardless of programming methods used to create the applications.

C. Short Cycling Prevention

1. Provide setpoint differentials and minimum on/off times to prevent equipment short cycling.

D. Equipment Status Delay

1. Provide an adjustable delay from when equipment is commanded on or off and when the control program looks to the status input for confirmation.

E. Run Time Accumulation

1. Use the Elapsed Time Property to provide re-settable run time accumulation for each Binary Output Object connected to mechanical loads greater than 1 HP, electrical loads greater than 10 KW, or wherever else specified.

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F. Timed Local Override

1. Provide an adjustable override time for each push of a timed local override button.

G. Time Synchronization

1. Provide time synchronization, including adjustments for leap years, daylight saving time, and operator time adjustments.

H. Scheduling

1. Provide operating schedules as indicated, with equipment assigned to groups. Changing the schedule of a group shall change the operating schedule of all equipment in the group. Groups shall be capable of operator creation, modification, and deletion.

2. Provide capability to view and modify schedules in a seven-day week format. 3. Provide capability to enter holiday and override schedules one full year at a time.

I. Object Property Override

1. Allow writeable object property values to accept overrides to any valid value. Where specified or required for the sequence of control, the Out-Of-Service property of Objects shall be modifiable using BACnet's write property service.

2. When documented, exceptions to these requirements are allowed for life, machine, and process safeties.

J. Alarms and Events

1. Alarms and events shall be capable of having programmed time delays and high-low limits.

2. When a computer workstation or web server is connected to the BACnet internetwork, alarms/events shall report to the computer, printer, e-mail, cell phone, as defined by an authorized operator. Otherwise alarms/events shall be stored within a device on the BACnet network until connected to a user interface device and retrieved. Provide alarms/events in agreement with the point schedule, sequence of operation, and the DDC SYSTEM Owner.

3. At a minimum, provide programming to initiate alarms/events any time a piece of equipment fails to operate, a control point is outside normal range or condition shown on schedules, communication to a device is lost, a device has failed, or a controller has lost its memory.

K. Trending

1. Provide BACnet trend services capable of trending all object present values set points, and other parameters indicated for trending on project schedules.

a. Trends may be associated into groups, and a trend report may be set up for each group.

b. Trends are stored within a device on the BACnet network, with operator selectable trend intervals from 10 seconds up to 60 minutes. The minimum number of consecutive trend values stored at one time shall be 100 per variable.

c. When trend memory is full, the most recent data shall overwrite the oldest data. d. The operator workstation shall upload trends automatically upon reaching 3/4 of

the device buffer limit (via Notification Threshold property), by operator request, or by time schedule for archiving.

e. Archived and real-time trend data shall be available for viewing numerically and graphically for at the workstation and connected notebook computers.

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L. Device Diagnostics

1. Each controller shall have diagnostic LEDs for power, communication, and device fault condition.

2. The DDC system shall recognize and report a non-responsive controller.

M. Power Loss

1. Upon restoration of power, the DDC system shall perform an orderly restart and restoration of control.

2.7 BACnet Operator Workstation

A. The workstation shall be furnished by Willard School Information Technology Department.

B. The workstation shall be capable of accessing all DDC system devices and communicate using the BACnet protocol.

1. The workstation shall be capable of displaying, modifying, creating, archiving, and deleting (as applicable): all points, objects, object properties, programming, alarms, trends, messages, schedules, and reports. The workstation computer and monitor shall be provided by Willard School.

C. Password Protection

1. Provide at least five levels of password protection for operator interfaces.

a. The lowest level only allow viewing graphics b. The second level allows viewing graphics and changing space temperature

setpoints. c. The third level allows the previous level's capability, plus changing operating

schedules. d. The fourth level allows access to all functions except passwords. e. The highest level provides all administrator rights and allows full access to all

programming, including setting new passwords and access levels.

2. Provide the Owner with the highest level password access. 3. Provide automatic log out if no keyboard or mouse activity is detected after a user-

defined time delay.

D. BACnet Operator Workstation DDC Software

1. Provide the workstation software with the manufacturer's installation CDs and licenses. Configure the software according to the DDC system manufacturer's specifications and in agreement with BACnet Operator Workstation (B-OWS) device standards found in ASHRAE 135, Annex L.

2. The workstation software shall permit complete monitoring, modification, and troubleshooting interface with the DDC system.

a. The operator interface with the software shall be menu-driven with appropriate displays and menu commands to manipulate the DDC system's objects, point data, operating schedules, control routines, system configuration, trends, alarms, messages, graphics, and reports.

b. Trends shall be capable of graphic display in real time, with variables plotted as functions of time. Each alarmed point shall be capable of displaying its alarm history, showing when it went into alarm, if and when it was acknowledged, and

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when it went out of alarm. The modification of DDC system parameters and object properties shall be accomplished with "fill in the blank" and/or "point and drag" methods. Modifications shall download to the appropriate controllers at the operator's request.

E. Graphics Software

1. Provide web-based system graphics viewable on browsers compatible with MS Internet Explorer 8.X or greater using an industry-standard file format such as HTML, BMP, JPEG, or GIF.

2. Graphic displays shall have full-screen resolution when viewed on the workstation and notebook computers.

a. Dynamic data on graphics pages shall refresh within 10 seconds using an Internet connection,

b. Graphics viewing shall not require additional "plug-in" software like Java, Shockwave and Flash applications unless the software is readily available for free over the Internet.

3. The graphics shall show the present value and object name for each of the project's I/O points on at least one graphic page.

a. Arrange point values and names on the graphic displays in their appropriate physical locations with respect to the floor plan or equipment graphic displayed. Graphics shall allow the operator to monitor current status, view zone and equipment summaries, use point-and-click navigation between graphic pages, and edit setpoints and parameters directly from the screens. Items in alarm shall be displayed using a different color or other obvious visual indicator.

b. Provide graphics with the following:

4. Graphic Types:

a. Provide at least one graphic display for each piece of HVAC equipment, building floor, and controlled zone.

b. Indicate dynamic point values, operating statuses, alarm conditions, and control setpoints on each display. Provide summary pages where appropriate.

5. Building Floor Plans:

a. Provide a floor plan graphic for each of the building's floors with dynamic display of space temperature and other important data.

b. If used, indicate and provide links to sub-plan areas. c. If possible, use the project's electronic drawing files for the graphic backgrounds. d. Provide clear names for important areas, such as "Main Conference Room."

Include room names and numbers where applicable. e. Include features such as stairwells, elevators, and main entrances. f. Where applicable, include the mechanical room, HVAC equipment, and control

component locations, with corresponding links to the equipment graphics.

6. Sub-plan Areas:

a. Where a building's floor plan is too large to adequately display on the screen, sub-divide the plan into distinct areas, and provide a separate graphic display for each area. Provide same level of detail requested in building floor plan section above.

7. HVAC Equipment:

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a. Provide a graphic display for each piece of HVAC equipment, such as a fan coil unit, VAV terminal, or air handling unit. Equipment shall be represented by a two or three-dimensional drawing.

b. Where multiple pieces of equipment combine to form a system, such as a central chiller plant or central heating plant, provide one graphic to depict the entire plant.

c. Indicate the equipment, piping, ductwork, dampers, and control valves in the installed location. Include labels for equipment, piping, ductwork, dampers, and control valves.

d. Show the direction of air and water flow. Include dynamic display of applicable object data with clear names in appropriate locations.

8. Sequence of Operation:

a. Provide a graphic screen displaying the written out full sequence of operation for each piece of HVAC equipment. Provide a link to the sequence of operation displays on their respective equipment graphics.

b. Include dynamic real-time data within the text for setpoints and variables.

9. Graphic Title:

a. Provide a prominent, descriptive title on each graphic page.

10. Dynamic Update: a. When the workstation is on-line, all graphic I/O object values shall update with

change-of-value services, or by operator selected discrete intervals.

11. Graphic Linking:

a. Provide forward and backward linking between floor plans, sub-plans, and equipment.

12. Graphic Editing: Provide installed software to create, modify, and delete the DDC graphics.

a. Include the ability to store graphic symbols in a symbol directory and import these symbols into the graphics.

13. Dynamic Point Editing:

a. Provide full editing capability for deleting, adding, and modifying dynamic points on the graphics.

F. Notebook Computer

1. Provide a notebook computer to be utilized by Willard school Maintenance personnel to directly access DDC System panels. Provide all software required for this purpose.

G. BACnet Protocol Analyzer

1. Provide a BACnet protocol analyzer and required cables and fittings for connection to the BACnet network.

2. The analyzer shall include the following minimum capabilities:

a. Capture and store to a file data traffic on all network levels. b. Measure bandwidth usage. c. Filtering options with ability to ignore select traffic.

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2.8 SENSORS AND INPUT HARDWARE

A. Coordinate sensor types with the DDC SYSTEM Owner to keep them consistent with existing installations.

B. Reporting Accuracy: Listed below are minimum acceptable reporting end-to-end accuracies for all values reported by the specified system:

Measured Variable Reported Accuracy Space temperature ±1 F Ducted air temperature ±1 F

Outdoor air temperature ±2 F

Dew Point ±3 F

Water temperature ±1 F Relative humidity ±3% RH Water flow ±1% of reading Air flow (terminal) ±10% of reading Air flow (measuring stations) ±5% of reading Carbon Monoxide (CO) ±5% of reading Carbon Dioxide (CO2) ±50 ppm Air pressure (ducts) ±0.1"w.c. Air pressure (space) ±0.001"w.c. Water pressure ±2% of full scale *Note 1 Electrical Power ±0.5% of reading

Note 1: for both absolute and differential pressure

C. Control stability and accuracy: Control sequences shall maintain measured variable at setpoint within the following tolerances:

Controlled Variable Control Accuracy Range of Medium Air Pressure ±0.2 in. w.g. 0–6 in. w.g. Air Pressure ±0.01 in. w.g. -0.1 to 0.1 in. w.g.

Airflow ±10% of full scale

Space Temperature ±1.5ºF

Duct Temperature ±2ºF

Humidity ±5% RH

Fluid Pressure ±1.5 psi 1–150 psi Fluid Pressure ±1.0 in. w.g. 0–50 in. w.g. differential

D. Extent of direct digital control: control design shall allow for at least the points indicated on the points lists on the drawings.

E. Field-Installed Temperature Sensors

1. Where feasible, provide the same sensor type throughout the project. Avoid using transmitters unless absolutely necessary.

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F. Thermistors

1. Precision thermistors may be used in applications below 200 degrees F. Sensor accuracy over the application range shall be 0.36 degree F or less between 32 to 150 degrees F. Stability error of the thermistor over five years shall not exceed 0.25 degrees F cumulative. A/D conversion resolution error shall be kept to 0.1 degrees F. Total error for a thermistor circuit shall not exceed 0.5 degrees F.

G. Resistance Temperature Detectors (RTDs)

1. Provide RTD sensors with platinum elements compatible with the digital controllers. 2. Encapsulate sensors in epoxy, series 300 stainless steel, anodized aluminum, or

copper. Temperature sensor accuracy shall be 0.1 percent (1 ohm) of expected ohms (1000 ohms) at 32 degrees F.

3. Temperature sensor stability error over five years shall not exceed 0.25 degrees F cumulative.

4. Direct connection of RTDs to digital controllers without transmitters is preferred 5. When RTDs are connected directly, lead resistance error shall be less than 0.25

degrees F. 6. The total error for a RTD circuit shall not exceed 0.5 degrees F.

H. Temperature Sensor Details

1. Room Type:

a. Provide the sensing element components within a decorative protective cover suitable for surrounding decor. Provide room temperature sensors with, setpoint adjustment lever, digital temperature display.

2. Duct Probe Type:

a. Ensure the probe is long enough to properly sense the air stream temperature.

3. Duct Averaging Type:

a. Continuous averaging sensors shall be one foot in length for each 4 square feet of duct cross-sectional area, and a minimum length of 6 feet.

4. Pipe Immersion Type:

a. Provide minimum three-inch immersion. Provide each sensor with a corresponding pipe-mounted sensor well, unless indicated otherwise.

b. Sensor wells shall be stainless steel when used in steel piping, and brass when used in copper piping. Provide the sensor well with a heat-sensitive transfer agent between the sensor and the well interior.

5. Outside Air Type:

a. Provide the sensing element on the building's north side with a protective weather shade that positions the sensor approximately 3 inches off the wall surface, does not inhibit free air flow across the sensing element, and protects the sensor from snow, ice, and rain.

I. Transmitters

1. Provide transmitters with 4 to 20 mA or 0 to 10 VDC linear output scaled to the sensed input. Transmitters shall be matched to the respective sensor, factory calibrated, and

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sealed. Size transmitters for an output near 50 percent of its full-scale range at normal operating conditions. The total transmitter error shall not exceed 0.1 percent at any point across the measured span. Supply voltage shall be 12 to 24 volts AC or DC. Transmitters shall have non-interactive offset and span adjustments. For temperature sensing, transmitter drift shall not exceed 0.03 degrees F a year.

2. Relative Humidity Transmitters

a. Provide transmitters with an accuracy equal to plus or minus 3 percent from 0 to 90 percent scale, and less than one percent drift per year.

b. Sensing elements shall be the polymer type. c. Sensor shall remain in calibration for 5 years.

3. Pressure Transmitters

a. Provide transmitters integral with the pressure transducer.

4. Current Transducers

a. Provide current transducers to monitor motor amperage, unless current switches are shown on design drawings or point tables.

J. CO2 Sensors

1. Provide photo-acoustic type CO2 sensors with integral transducers and linear output. The devices shall read CO2 concentrations between 0 and 2000 ppm with full scale accuracy of at least plus or minus 100 ppm. Sensor shall remain in calibration for 10 years.

K. Natural Gas Flow Meter and Pressure Sensor

1. Natural Gas Flow Meter and Pressure sensor shall be a combination thermal dispersion mass flow meter with optional pressure sensing. Device shall communicate to DDC System through Modbus communication protocol. Design basis Manufacturer Sierra Instruments model QuadraTherm 640i. Provide inline flow conditioner as required to meet straight pipe length requirement before and after meter/sensor.

L. Refrigerant Monitoring System

1. DDC System shall furnish and install complete refrigerant monitoring system including but not limited to; refrigerant monitor, 3 refrigerant sensors and horn/strobes to provide local alerts of an alarm. System shall be utilized to monitor Refrigerant R134a. Shall be manufactured by Critical Environment Technologies Model PDC Multi-Channel Controller.

2.9 Input Switches

A. Timed Local Overrides

1. Provide buttons or switches to override the DDC occupancy schedule programming during unoccupied periods, and to return HVAC equipment to the occupied mode, for AHU-6 per the Sequence of Operation

a. This requirement is waived for zones clearly intended for 24 hour continuous operation.

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B. Line-Voltage, On-Off Thermostats: Bimetal-actuated, open contact or bellows-actuated, enclosed, snap-switch or equivalent solid-state type, with heat anticipator; listed for electrical rating; with concealed set-point adjustment, 55 to 85 deg F set-point range, and 2 deg F maximum differential.

1. Electric Heating Thermostats: Equip with off position on dial wired to break ungrounded conductors.

2. Selector Switch: Integral, manual on-off-auto.

C. Power Monitor: 3-phase type with disconnect/shorting switch assembly, listed voltage and current transformers, with pulse kilowatt hour output and 4- to 20-mA kW output, with maximum 2 percent error at 1.0 power factor and 2.5 percent error at 0.5 power factor.

D. High Duct Static Pressure Switch

E. Static Pressure Sensors: Non-directional, temperature compensated.

1. 4-20 ma output signal. 2. 0 to 5 inches wg for duct static pressure range. 3. 0 to 0.25 inch wg for Building static pressure range.

F. Freeze Protection Thermostats

1. Provide special purpose thermostats with flexible capillary elements 20 feet minimum length for coil face areas up to 20 square feet.

2. Provide longer elements for larger coils at 1-foot of element for every 1 square feet of coil face area, or provide additional thermostats. Provide switch contacts rated for the respective motor starter's control circuit voltage. Include auxiliary contacts for the switch's status condition.

a. A freezing condition at any 12-inch increment along the sensing element's length shall activate the switch.

b. The thermostat shall be equipped with a manual push-button reset switch so that when tripped, the thermostat requires manual resetting before the HVAC equipment can restart.

G. Air Flow Measurement Stations

1. Air flow measurement stations shall have an array of velocity sensing elements and straightening vanes inside a flanged sheet metal casing. The velocity sensing elements shall be the RTD or thermistor type, traversing the ducted air in at least two directions. The air flow pressure drop across the station shall not exceed 0.08 inch water gage at a velocity of 2,000 fpm. The station shall be suitable for air flows up to 5,000 fpm, and a temperature range of minus 20 to 120 degrees F. The station's measurement accuracy over the range of 125 to 2,500 fpm shall be plus or minus 3 percent of the measured velocity. Station transmitters shall provide a linear, temperature-compensated 4 to 20 mA or 0 to 10 VDC output. The output shall be capable of being accurately converted to a corresponding air flow rate in cubic feet per minute. The output error of the transmitter shall not exceed 0.5 percent of the measurement. air flow measurement stations shall be capable of reading airflow down to 0 feet per minute airflow velocty.

2. Air Flow Measurement Stations shall be manufactured by Ebtron or equal meeting the above specification. Model and accessories appropriate for the application.

H. Water flow sensors:

1. Type: Insertion vortex type with retractable probe assembly and 2 inch full port gate valve.

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a. Pipe size: 3 to 24 inches.

2. Retractor:

a. ASME threaded, non-rising stem type with hand wheel. c. b. Mounting connection 2 inch 150 PSI flange.

3. Sensor assembly:

a. Design for expected water flow and pipe size.

4. Seal: Teflon (PTFE). 5. Controller:

a. Integral to unit. b. Locally display flow rate and total. c. Output flow signal to DDC System: d. Digital pulse type.

6. Performance:

a. Turndown: 20:1 b. Response time: Adjustable from 1 to 100 seconds. c. Power: 24 volt DC

7. Install flow meters according to manufacturer’s recommendations.

a. Where recommended by manufacturer because of mounting conditions, provide flow rectifier.

I. Flow switches:

1. Shall be either paddle or differential pressure type.

a. Paddle-type switches (liquid service only) shall be UL Listed, SPDT snap-acting, adjustable sensitivity with NEMA 4 enclosure.

b. Differential pressure type switches (air or water service) shall be UL listed, SPDT snap acting, NEMA 4 enclosure, with scale range and differential suitable for specified application.

J. Current Switches:

1. Current operated switches shall be self powered, solid state with adjustable trip current as well as status, power, and relay command status LED indication.

2. The switches shall be selected to match the current of the application and output requirements of the DDC systems.

2.10 OUTPUT HARDWARE

A. Control Dampers

1. Provide factory manufactured [galvanized][stainless] steel dampers where indicated. Control dampers shall comply with SMACNA 1966 except as modified or supplemented by this specification. Published damper leakage rates and respective pressure drops shall have been verified by tests in compliance with AMCA 500-D requirements.

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2. Provide damper assembly frames constructed of 0.064 inch minimum thickness galvanized steel channels with mitered and welded corners. Damper axles shall be 0.5 inches minimum diameter plated steel rods supported in the damper frame by stainless steel or bronze bearings. Blades mounted vertically shall be supported by thrust bearings.

3. Dampers shall be rated for not less than 2000 fpm air velocity. The pressure drop through each damper when full-open shall not exceed 0.04 inches water gage at 1000 fpm face velocity. Damper assemblies in ductwork subject to above 3-inch water gauge static air pressure shall be constructed to meet SMACNA Seal Class "A" construction requirements.

4. Provide the damper operating linkages outside of the air stream, including crank arms, connecting rods, and other hardware that transmits motion from the damper actuators to the dampers, shall be adjustable. Additionally, operating linkages shall be designed and constructed to have a 2 to 1 safety factor when loaded with the maximum required damper operating force. Linkages shall be brass, bronze, galvanized steel, or stainless steel.

5. Provide access doors or panels in hard ceilings and walls for access to all concealed damper operators and damper locking setscrews.

6. For field-installed control dampers, a single damper section shall have blades no longer than 48 inches and no higher than 72 inches. The maximum damper blade width shall be 12 inches. Larger sized dampers shall be built using a combination of sections.

7. Frames shall be at least 2 inches wide. Flat blades shall have edges folded for rigidity. Blades shall be provided with compressible gasket seals along the full length of the blades to prevent air leakage when closed.

8. The damper frames shall be provided with jamb seals to minimize air leakage. Seals shall be suitable for an operating temperature range of minus 40 degrees F to 200 degrees F.

9. The leakage rate of each damper when full-closed shall be no more than 4 cfm per sq. foot of damper face area at 1.0 inches water gage static pressure.

2.11 Control Valves

A. Valve Assembly

1. Valve bodies shall be designed for 125 psig minimum working pressure or 150 percent of the operating pressure, whichever is greater.

2. Valve stems shall be Type 316 stainless steel. Valve leakage ratings shall be 0.01 percent of rated Cv value.

3. Class 125 copper alloy valve bodies and Class 150 steel or stainless steel valves shall meet the requirements of ASME B16.5.

4. Cast iron valve components shall meet the requirements of ASTM A126 Class B or C.

B. Butterfly Valves

1. Butterfly valves shall be the threaded lug type suitable for dead-end service and for modulation to the fully-closed position, with stainless steel shafts supported by bearings, non-corrosive discs geometrically interlocked with or bolted to the shaft (no pins), and EPDM seats suitable for temperatures from minus 20 degrees F to plus 250 degrees F. Valves shall have a means of manual operation independent of the actuator.

C. Two-Way Valves

1. Two-way modulating valves shall have an equal percentage characteristic.

D. Three-Way Valves

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1. Three-way valves shall have an equal percentage characteristic.

E. Valves for Chilled Water, and Condenser Water Service.

1. Bodies for valves 1-1/2 inches and smaller shall be brass or bronze, with threaded or union ends.

2. Bodies for valves from 2 inches to 3 inches inclusive shall be of brass, bronze, or iron.

a. Bodies for 2 inch valves shall have threaded connections.

3. Bodies for valves from 2-1/2 to 3 inches shall have flanged connections. 4. Internal valve trim shall be brass or bronze, except that valve stems shall be stainless

steel. 5. Unless indicated otherwise, provide modulating valves sized for 2 psi minimum and 4

psi maximum differential across the valve at the design flow rate. 6. Valves 4 inches and larger shall be butterfly valves, unless indicated otherwise.

F. Valves for Hot Water Service below 250 Degrees F:

1. Bodies for valves 1-1/2 inches and smaller shall be brass or bronze, with threaded or union ends. Bodies for valves from 2 inches to 3 inches inclusive shall be of brass, bronze, or iron. Bodies for 2 inch valves shall have threaded connections.

2. Bodies for valves from 2-1/2 inches and greater shall have flanged connections. 3. Internal trim (including seats, seat rings, modulation plugs, valve stems, and springs) of

valves controlling water above 210 degrees F shall be Type 316 stainless steel. 4. Internal trim for valves controlling water 210 degrees F or less shall be brass or bronze.

Valve stems shall be Type 316 stainless steel. 5. Non-metallic parts of hot water control valves shall be suitable for a minimum

continuous operating temperature of 121 250 degrees F or 50 degrees F above the system design temperature, whichever is higher.

6. Unless indicated otherwise, provide modulating valves sized for 2 psi minimum and 4 psi maximum differential across the valve at the design flow rate.

7. Valves 4 inches and larger shall be butterfly valves, unless indicated otherwise.

G. Pressure Independent Control Valves (PICV)

1. NPS 2 1/2 and Smaller: Forged brass body rated at no less than 400 PSI, chrome plated brass ball and stem, female NPT union ends, dual EPDM lubricated O-rings and TEFZEL characterizing disc.

2. Accuracy: The control valves shall accurately control the flow from 0 to 100% full rated flow with an operating pressure differential range of 5 to 50 PSID across the valve. The valves shall have equal percentage flow characteristics

3. Close-Off Pressure Rating: 200 PSI. 4. All actuators shall be electronically programmed by use of external computer software

for the adjustment of flow. Programming using actuator mounted switches or multi-turn actuators are not acceptable.

5. The actuator shall be the same manufacturer as the valve, integrally mounted to the valve at the factory with a single screw on a four-way DIN mounting-base.

6. The control valve shall require no maintenance and shall not include replaceable cartridges.

7. The manufacturer shall warrant all components for a period of 5 years from the date of production, with the first two years unconditional.

8. The use of pressure independent valves piped in parallel to achieve the rated coil flow shall be permitted. Actuators shall be electronically programmed to permit sequencing the flow with a single control output point. The use of external devices to permit sequencing is not acceptable.

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H. Actuators

1. Provide direct-drive electric actuators for all control applications, except where indicated otherwise.

I. Electric Actuators

1. Each actuator shall deliver the torque required for continuous uniform motion and shall have internal end switches to limit the travel, or be capable of withstanding continuous stalling without damage.

2. Actuators shall function properly within 85 to 110 percent of rated line voltage.

a. Provide actuators with hardened steel running shafts and gears of steel or copper alloy.

3. Fiber or reinforced nylon gears may be used for torques less than 16 inch-pounds.

a. Provide two-position actuators of single direction, spring return, or reversing type. b. Provide modulating actuators capable of stopping at any point in the cycle, and

starting in either direction from any point.

4. Actuators shall be equipped with a switch for reversing direction, and a button to disengage the clutch to allow manual adjustments.

a. Provide the actuator with a hand crank for manual adjustments, as applicable.

5. Thermal type actuators may only be used on terminal fan coil units, terminal VAV units, convectors, and unit heaters. Spring return actuators shall be provided on all control dampers and all control valves except terminal fan coil units, terminal VAV units, convectors, and unit heaters; unless indicated otherwise.

6. Each actuator shall have distinct markings indicating the full-open and full-closed position, and the points in-between.

2.12 OUTPUT SWITCHES

A. Control Relays

1. Field installed and DDC panel relays shall be double pole, double throw, UL listed, with contacts rated for the intended application, indicator light, and dust proof enclosure.

a. The indicator light shall be lit when the coil is energized and off when coil is not energized.

2. Relays shall be the socket type, plug into a fixed base, and replaceable without tools or removing wiring.

3. Encapsulated "PAM" type relays may be used for terminal control applications.

2.13 ELECTRICAL POWER AND DISTRIBUTION

A. Transformers

1. Transformers shall conform to UL 506.

a. For control power other than terminal level equipment, provide a fuse or circuit breaker on the secondary side of each transformer.

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B. Surge and Transient Protection

1. Provide each digital controller with surge and transient power protection. Surge and transient protection shall consist of the following devices, installed externally to the controllers.

C. Power Line Surge Protection

1. Provide surge suppressors on the incoming power at each controller or grouped terminal controllers.

2. Surge suppressors shall be rated in accordance with UL 1449, have a fault indicating light, and conform to the following:

a. The device shall be a transient voltage surge suppressor, hard-wire type individual equipment protector for 120 VAC/1 phase/2 wire plus ground.

b. The device shall react within 5 nanoseconds and automatically reset. c. The type and level of protection shall be selected by the Controls Contractor,

unless noted otherwise. d. The device shall have an indication light to indicate the protection components

are functioning. e. All system functions of the transient suppression system shall be individually

fused and not short circuit the AC power line at any time. f. Surge protection for Direct Digital Control panels serving the boiler and chiller

plants shall be a combination surge protector and noise filter such as Leviton 51020-0WM or approved equal, and located within the Direct Digital Control panel enclosure.

D. Telephone and Communication Line Surge Protection

1. Provide surge and transient protection for DDC controllers and DDC network related devices connected to phone and network communication lines, in accordance with the following:

a. The device shall provide continuous, non-interrupting protection, and shall automatically reset after safely eliminating transient surges.

b. The protection shall react within 5 nanoseconds using only solid-state silicon avalanche technology.

c. The device shall be installed at the distance recommended by its manufacturer.

E. Controller Input/Output Protection

1. Provide controller inputs and outputs with surge protection via optical isolation, metal oxide varistors (MOV), or silicon avalanche devices. Fuses are not permitted for surge protection.

F. Wiring

1. Provide complete less than 100 volts electrical wiring for the DDC System.

G. Power Wiring

1. All electrical wiring 100 volts and greater is furnished an installed by the Electrical Contractor. DDC System Contractor to coordinate with Electrical Contractor.

2. The following requirements are for field-installed wiring:

a. Wiring for 24 V circuits shall be insulated copper 18 AWG minimum and rated for 300 VAC service.

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H. Analog Signal Wiring

1. Field-installed analog signal wiring shall be 18 AWG single or multiple twisted pair.

a. Each cable shall be 100 percent shielded and have a 20 AWG drain wire. b. Each wire shall have insulation rated for 300 VAC service. Cables shall have an

overall aluminum-polyester or tinned-copper cable-shield tape.

2.14 Pneumatic Tubing

A. Copper Tubing

1. Provide ASTM B75 or ASTM B88M ASTM B88 rated tubing. 2. Tubing 0.64 mm 0.375 inch outside diameter and larger shall have minimum wall

thickness equal to ASTM B88M ASTM B88, Type M. Tubing less than 10 mm 0.375 inch outside diameter shall have minimum wall thickness of 0.64 mm 0.025 inch. Exposed tubing and tubing for working pressures greater than 30 psig shall be hard copper. Fittings shall be ASME B16.18 or ASME B16.22 solder type using ASTM B32 95-5 tin-antimony solder, or ASME B16.26 compression type.

B. Polyethylene Tubing

1. Polyethylene tubing may only be used in systems with working pressure of 30 psig or less.

2. Provide flame-resistant, multiple polyethylene tubing in flame-resistant protective sheath with mylar barrier, or unsheathed polyethylene tubing in rigid metal, intermediate metal, or electrical metallic tubing conduit for areas where tubing is exposed.

3. Single, unsheathed, flame-resistant polyethylene tubing may be used where concealed in walls or above ceilings and within control panels.

4. Do not provide polyethylene tubing for smoke removal systems.

a. Provide compression or brass barbed push-on type fittings.

5. Extruded seamless polyethylene tubing shall conform to the following:

a. Minimum Burst Pressure Requirements: 100 psig at 75 degrees F to 25 psig at 150 degrees F.

b. Stress Crack Resistance: ASTM D1693, 200 hours minimum. c. Tensile Strength (Minimum): ASTM D638, 1100 psi. d. Flow Rate (Average): ASTM D1238, 0.30 decigram per minute. e. Density (Average): ASTM D792, 57.5 pounds per cubic feet. f. Burn rate: ASTM D635

PART 3 - EXECUTION

3.1 INSTALLATION

A. BACnet Naming and Addressing

1. Coordinate with the DDC SYSTEM Owner and provide unique naming and addressing for BACnet networks and devices.

a. MAC Address

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2. Every BACnet device shall have an assigned and documented MAC Address unique to its network.

a. For Ethernet networks, document the MAC Address assigned at its creation. b. For ARCNET or MS/TP, assign from 00 to 64.

3. Network Numbering

a. Assign unique numbers to each new network installed on the BACnet internetwork.

b. Provide ability for changing the network number; either by device switches, network computer, or field operator interface. The BACnet internetwork (all possible connected networks) can contain up to 65,534 possible unique networks.

4. Device Object Identifier Property Number

a. Assign unique Device "Object_Identifier" property numbers or device instances for each device on the BACnet internetwork.

b. Provide for future modification of the device instance number; either by device switches, network computer, or field interface. BACnet allows up to 4,194,302 possible unique devices per internetwork.

5. Device Object Name Property Text

a. The Device Object Name property field shall support 32 minimum printable characters.

b. Assign unique Device "Object_Name" property names with plain-English descriptive names for each device For example, the Device Object Name that for the device controlling the chiller plant at Building 3408 would be:

1) Device Object_Name = CW System B3408 2) A Device Object Name for a VAV box controller might be: Device

Object_Name = VAV BOX25

6. Object Name Property Text (Other than Device Objects)

a. The Object Name property field shall support 32 minimum printable characters. b. Assign Object Name properties with plain-English names descriptive of the

application.

1) Examples include "Zone 1 Temperature" and "Fan Start/Stop".

7. Object Identifier Property Number (Other than Device Objects)

a. Assign Object Identifier property numbers according to design drawings or tables if provided.

b. If not provided, Object Identifier property numbers may be assigned at the Contractor's discretion but must be approved by the Engineer. In this case they must be documented and unique for like object types within the device.

B. Minimum BACnet Object Requirements

1. Use of Standard BACnet Objects

a. For the following points and parameters, use standard BACnet objects, where all relevant object properties can be read using BACnet's Read Property Service,

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and all relevant object properties can be modified using BACnet's Write Property Service:

1) all device physical inputs and outputs, all set points, all PID tuning parameters, all calculated pressures, flow rates, and consumption values, all alarms, all trends, all schedules, and all equipment and lighting circuit operating status.

2. BACnet Object Description Property

a. The Object Description property shall support 32 minimum printable characters. b. For each object, complete the description property field using a brief, narrative,

plain English description specific to the object and project application.

1) For example: "HW Pump 1 Proof." Document compliance, length restrictions, and whether the description is writeable in the device PICS.

3. Analog Input, Output, and Value Objects

a. Support and provide Description and/or Device_Type text strings matching signal type and engineering units shown on the points list.

4. Binary Input, Output, and Value Objects

a. Support and provide Inactive_Text and Active_Text property descriptions matching conditions shown on the points list.

5. Calendar Object

a. For devices with scheduling capability, provide at least one Calendar Object with ten-entry capacity.

b. All operators may view Calendar Objects; authorized operators may make modifications from a workstation. Enable the writeable Date List property and support all calendar entry data types.

6. Schedule Object

a. Use Schedule Objects for all building system scheduling. b. All operators may view schedule entries; authorized operators may modify

schedules from a workstation.

7. Loop Object or Equal

a. Use Loop Objects or equivalent BACnet objects in each applicable field device for PID control.

b. Regardless of program method or object used, allow authorized operators to adjust the Update Interval, Setpoint, Proportional Constant, Integral Constant, and Derivative Constant using BACnet read/write services.

C. Minimum BACnet Service Requirements

1. Command Priorities

a. Use commandable BACnet objects to control machinery and systems, providing the priority levels listed below. If the sequence of operation requires a different priority, obtain approval from the Engineer.

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Priority Level Application 1 Manual-Life Safety 2 Automatic-Life Safety 3 (User Defined) 4 (User Defined) 5 Critical Equipment Control 6 Minimum On/Off 7 (User Defined) 8 Manual Operator 9 (User Defined)

10 (User Defined) 11 Load Shedding 12 (User Defined) 13 (User Defined) 14 (User Defined) 15 (User Defined) 16 (User Defined)

2. Alarming

a. Alarm Priorities - Coordinate alarm and event notification with the DDC SYSTEM Owner.

b. Notification Class – Enable writeable Priority, Ack Required, and Recipient List properties of Notification Class objects.

c. Event Notification Message Texts - Use condition specific narrative text and numerical references for alarm and event notification.

3. Updating Displayed Property Values

a. Allow workstations to display property values at discrete polled intervals, or based on receipt of confirmed and unconfirmed Change of Value notifications. The COV increment shall be adjustable by an operator using BACnet services, and polled intervals shall be adjustable at the operator workstation.

D. Local Area Networks

1. Obtain Owner approval before connecting new networks with existing networks. Network numbers and device instance numbers shall remain unique when joining networks. Do not change existing network addressing without Owner approval. See also "BACnet Naming and Addressing".

E. BACnet Routers, Bridges, and Switches

1. Provide the quantity of BACnet routers, bridges, and switches necessary for communications shown on the BACnet Communication Architecture schematic. Provide BACnet routers with BACnet Broadcast Message Device (BBMD) capability on each BACnet internetwork communicating across an IP network. Configure each BACnet device and bridge, router, or switch to communicate on its network segment.

F. Wiring Criteria

1. Run circuits operating at more than 100 volts in rigid or flexible conduit, metallic tubing, covered metal raceways, or armored cable.

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2. Do not run binary control circuit wiring in the same conduit as power wiring over 100 volts.

a. Where analog signal wiring requires conduit, do not run in the same conduit with AC power circuits or control circuits operating at more than 100 volts.

3. Provide circuit and wiring protection required by NFPA 70. 4. Run all wiring located inside mechanical rooms in conduit. 5. Do not bury aluminum-sheathed cable or aluminum conduit in concrete. 6. Input/output identification:

a. Permanently label each field-installed wire, cable, and pneumatic tube at each end with descriptive text using a commercial wire marking system that fully encircles the wire, cable, or tube. Locate the markers within 2 inches of each termination. Match the names and I/O number to the project's point list. Similarly label all power wiring serving control devices, including the word "power" in the label.

7. Number each pneumatic tube every six feet. Label all terminal blocks with alpha/numeric labels. All wiring and the wiring methods shall be in accordance with UL 508A.

8. For controller power, provide new 120 VAC circuits, with ground. 9. Provide each circuit with a dedicated breaker, and run wiring in its own conduit,

separate from any control wiring.

a. Connect the controller's ground wire to the electrical panel ground; conduit grounds are not acceptable.

10. Surge Protection:

a. Install surge protection according to manufacturer's instructions. Multiple controllers fed from a common power supply may be protected by a common surge protector, properly sized for the total connected devices.

11. Grounding:

a. Ground controllers and cabinets to a good earth ground as specified in Section 26. Conduit grounding is not acceptable; all grounding shall have a direct path to the building earth ground. Ground sensor drain wire shields at the controller end.

12. The Contractor shall be responsible for correcting all associated ground loop problems. 13. Run wiring in panel enclosures in covered wire track.

G. Accessibility

1. Install all equipment so that parts requiring periodic inspection, operation, maintenance, and repair are readily accessible.

2. Install digital controllers, data ports, and concealed actuators, valves, dampers, and like equipment in locations freely accessible through access doors.

H. Digital Controllers

1. Install as standalone control devices (see definitions). 2. Locate control cabinets at the locations shown on the drawings. 3. If not shown on the drawings, install in the most accessible space, close to the

controlled equipment.

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I. Hand-Off-Auto Switches

1. Wire safety controls such as smoke detectors and freeze protection thermostats to protect the equipment during both hand and auto operation.

J. Temperature Sensors

1. Install temperature sensors in locations that are accessible and provide a good representation of sensed media. Installations in dead spaces are not acceptable. Calibrate sensors according to manufacturer's instructions. Do not use sensors designed for one application in a different application.

K. Room Temperature Sensors

1. Mount the sensors on interior walls to sense the average room temperature at the locations indicated.

2. Avoid locations near heat sources such as copy machines or locations by supply air outlet drafts.

3. Mount the center of the sensor 4 feet above the finished floor to meet ADA requirements.

L. Duct Temperature Sensors

1. Probe Type:

a. Provide a gasket between the sensor housing and the duct wall. b. Seal the duct penetration air tight. Seal the duct insulation penetration vapor tight.

2. Averaging Type (and coil freeze protection thermostats):

a. Weave the capillary tube sensing element in a serpentine fashion perpendicular to the flow, across the duct or air handler cross-section, using durable non-metal supports. Prevent contact between the capillary and the duct or air handler internals. Provide a duct access door at the sensor location. The access door shall be hinged on the side, factory insulated, have cam type locks, and be as large as the duct will permit, maximum 18 by 18 inches.

b. For sensors inside air handlers, the sensors shall be fully accessible through the air handler's access doors without removing any of the air handler's internals.

M. Immersion Temperature Sensors

1. Provide thermowells for sensors measuring piping, tank, or pressure vessel temperatures. Locate wells to sense continuous flow conditions. Do not install wells using extension couplings. Where piping diameters are smaller than the length of the wells, provide wells in piping at elbows to sense flow across entire area of well. Wells shall not restrict flow area to less than 70 percent of pipe area. Increase piping size as required to avoid restriction.

2. Provide thermal conductivity material within the well to fully coat the inserted sensor.

N. Outside Air Temperature Sensors

1. Provide outside air temperature sensors in weatherproof enclosures on the north side of the building, away from exhaust hoods and other areas that may affect the reading. Provide a shield to shade the sensor from direct sunlight.

O. Energy Meters

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1. Locate energy meters as indicated. 2. Connect each meter output to the DDC system, to measure both instantaneous and

accumulated energy usage, and as described in the sequence of operations.

P. Damper Actuators

1. Where possible, mount actuators outside the air stream in accessible areas.

Q. Thermometers and Gages 1. Mount devices to allow reading while standing on the floor or ground, as applicable.

R. Pressure Sensors

1. Locate pressure sensors as indicated.

S. Pneumatic Tubing

1. Run tubing concealed in finished areas, run tubing exposed in unfinished areas like mechanical rooms.

2. For tubing enclosed in concrete, provide rigid metal conduit. 3. Run tubing parallel and perpendicular to building walls.

a. Use 5 foot maximum spacing between tubing supports. b. With the compressor turned off, test each tubing system pneumatically at 1.5

times the working pressure and prove it air tight, locating and correcting leaks as applicable. Caulking joints is not permitted. Do not run tubing and electrical power conductors in the same conduit.

T. Component Identification Labeling

1. Using an electronic hand-held label maker with white tape and bold black block lettering, provide an identification label on the exterior of each new control panel, control device, actuator, and sensor.

a. Also provide labels on the exterior of each new control actuator indicating the (full) open and (full) closed positions. For labels located outdoors, use exterior grade label tape, and provide labels on both the inside and outside of the panel door or device cover.

2. Acceptable alternatives are white plastic labels with engraved bold black block lettering permanently attached to the control panel, control device, actuator, and sensor. Have the labels and wording approved by the DDC SYSTEM Owner prior to installation.

U. Network Communication Lines

1. When network connections by the Owner are required, provide the Owner at least 60 days advance notice of need.

3.2 TEST AND BALANCE SUPPORT

A. The controls contractor shall coordinate with and provide on-site support to the test and balance (TAB) personnel [specified under Section 23 TESTING, ADJUSTING AND BALANCING.

1. This support shall include:

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a. On-site operation and manipulation of control systems during the testing and balancing.

b. Control setpoint adjustments for balancing all relevant mechanical systems, including VAV boxes.

c. Tuning control loops with setpoints and adjustments determined by TAB personnel.

3.3 COMMISSIONING AGENT SUPPORT

A. The DDC System Contractor shall coordinate with the Commissioning Agent and provide on-site support to the Commissioning Agent.

B. The DDC System Contractor shall review the Commissioning Specifications and Commissioning Plan and include all stated and implied DDC System Contractor requirements in bid.

3.4 POST WARRANTY END DATE SUPPORT

A. See CONTROLS SYSTEM OPERATORS MANUALS below.

3.5 CONTROLS SYSTEM OPERATORS MANUALS

A. Provide four electronic and printed copies of a Controls System Operators Manual. The manual shall be specific to the project, written to actual project conditions, and provide a complete and concise depiction of the installed work.

1. Provide information in detail to clearly explain all operation requirements for the control system.

B. Provide with each manual: CDs of the project's control system drawings, control programs, data bases, graphics, and all items listed below. Include gateway back-up data and configuration tools where applicable.

C. Provide CDs in jewel case with printed and dated project-specific labels on both the CD and the case.

1. For text and drawings, use Adobe Acrobat or MS Office file types. 2. When approved by the Engineer, AutoCAD and Visio files are allowed. 3. Give files descriptive English names and organize in folders.

D. Provide printed manuals in sturdy 3-ring binders with a title sheet on the outside of each binder indicating the project title, project location, contract number, and the controls contractor name, address, and telephone number.

1. Each binder shall include a table of contents and tabbed dividers, with all material neatly organized.

2. Manuals shall include the following:

a. A copy of the as-built control system (shop) drawings set, with all items specified under the paragraph "Submittals." Indicate all field changes and modifications.

b. A copy of the project's mechanical design drawings, including any official modifications and revisions.

c. A copy of the project's approved Product Data submittals provided under the paragraph "Submittals."

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d. A copy of the project's approved Performance Verification Testing Plan and Report.

e. A copy of the project's approved final TAB Report. f. Printouts of all control system programs, including controller setup pages if used.

Include plain-English narratives of application programs, flowcharts, and source code.

g. Printouts of all physical input and output object properties, including tuning values, alarm limits, calibration factors, and set points.

h. A table entitled "AC Power Table" listing the electrical power source for each controller.

1) Include the building electrical panel number, panel location, and circuit breaker number.

i. The DDC manufacturer's hardware and software manuals in both print and CD format with printed project-specific labels. Include installation and technical manuals for all controller hardware, operator manuals for all controllers, programming manuals for all controllers, operator manuals for all workstation software, installation and technical manuals for the workstation and notebook, and programming manuals for the workstation and notebook software.

j. A list of qualified control system service organizations for the work provided under this contract.

1) Include their addresses and telephone numbers.

k. A written statement entitled "Technical Support" stating the control system manufacturer or authorized representative will provide toll-free telephone technical support at no additional cost to the Owner for a minimum of two years from warranty start date, shall be furnished by experienced service technicians, and will be available during normal weekday working hours.

1) Include the toll-free technical support telephone number.

l. A written statement entitled "Software Upgrades" stating software and firmware patches and updates shall be provided at no additional cost to the Owner for a minimum of two years from warranty start date. Include a table of all DDC system software and firmware provided under this contract, listing the original release dates, version numbers, part numbers, and serial numbers.

3.6 PERFORMANCE VERIFICATION TESTING (PVT)

A. General

1. The PVT shall demonstrate compliance of the control system work with the contract requirements. The PVT shall be performed by the Contractor and witnessed and approved by the Engineer.

2. If the project is phased, provide separate testing for each phase. A Pre-PVT meeting to review the Pre-PVT Checklist is required to coordinate all aspects of the PVT and shall include the Contractor's QA representative, the Contractor's PVT administrator, and the Owner.

B. Performance Verification Testing Plan

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C. Submit a detailed PVT Plan of the proposed testing for Engineer approval. Develop the PVT Plan specifically for the control system in this contract. The PVT Plan shall be a clear list of test items arranged in a logical sequence.

1. Include the intended test procedure, the expected response, and the pass/fail criteria for every component tested.

2. The plan shall clearly describe how each item is tested, indicate where assisting personnel are required (like the mechanical contractor), and include what procedures are used to simulate conditions.

3. Include a separate column for each checked item and extra space for comments.

D. PVT Sample Size

1. Test all central plant equipment and primary air handling unit controllers unless otherwise directed.

2. Twenty percent sample testing is allowed for identical controllers typical of terminal control like VAV boxes and fan coil units.

3. The Engineer may require testing of like controllers beyond a statistical sample if sample controllers require retesting or do not have consistent results.

4. The Engineer may witness all testing, or random samples of PVT items. When only random samples are witnessed, the Engineer may choose which ones.

E. Pre-Performance Verification Testing Checklist

1. Submit the following as a list with items checked off once verified. Provide a detailed explanation for any items that are not completed or verified.

a. Verify all required mechanical installation work is successfully completed, and all HVAC equipment is working correctly (or will be by the time the PVT is conducted).

b. Verify all required control system components, wiring, and accessories are installed.

c. Verify the installed control system architecture matches approved drawings. d. Verify all control circuits operate at the proper voltage and are free from grounds

or faults. e. Verify all required surge protection is installed. f. Verify the A/C Power Table specified in "CONTROLS SYSTEM OPERATORS

MANUALS" is accurate. g. Verify all DDC network communications function properly, including uploading

and downloading programming changes. h. Using the BACnet protocol analyzer, verify communications are error free. i. Verify each digital controller’s programming is backed up. j. Verify all wiring, components, and panels are properly labeled. k. Verify all required points are programmed into devices. l. Verify all TAB work affecting controls is complete. m. Verify all valve and actuator zero and span adjustments are set properly. n. Verify all sensor readings are accurate and calibrated. o. Verify each control valve and actuator goes to normal position upon loss of

power. p. Verify all control loops are tuned for smooth and stable operation. View trend data

where applicable. q. Verify each controller works properly in stand-alone mode. r. Verify all safety controls and devices function properly, including freeze protection

and interfaces with building fire alarm systems. s. Verify all electrical interlocks work properly.

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t. Verify all workstations, notebooks and maintenance personnel interface tools are delivered, all system and database software is installed, and graphic pages are created for each workstation and notebook.

u. Verify the as-built (shop) control drawings are completed.

2. Conducting Performance Verification Testing

a. Conduct Engineer-witnessed PVT after approval of the PVT Plan and the completed Pre-PVT Checklist.

b. Notify the engineer of the planned PVT at least 15 days prior to testing. Provide an estimated time table required to perform the testing. Furnish personnel, equipment, instrumentation, and supplies necessary to perform all aspects of the PVT. Ensure that testing personnel are regularly employed in the testing and calibration of DDC systems. Using the project's as-built control system drawings, the project's mechanical design drawings, the approved Pre-PVT Checklist, and the approved PVT Plan, conduct the PVT.

c. During testing, identify any items that do not meet the contract requirements and if time permits, conduct immediate repairs and re-test. Otherwise, deficiencies shall be investigated, corrected, and re-tested later.

d. Document each deficiency and corrective action taken. e. If re-testing is required, follow the procedures for the initial PVT. f. The Engineer may require re-testing of any control system components affected

by the original failed test.

F. Controller Capability and Labeling

1. Test the following for each controller:

a. Memory:

1) Demonstrate that programmed data, parameters, and trend/ alarm history collected during normal operation is not lost during power failure.

b. Direct Connect Interface:

1) Demonstrate the ability to connect directly to each type of digital controller with a portable electronic device like a notebook computer.

2) Show that maintenance personnel interface tools perform as specified in the manufacturer's technical literature.

c. Stand Alone Ability:

1) Demonstrate controllers provide stable and reliable stand-alone operation using default values or other method for values normally read over the network.

d. Wiring and AC Power:

1) Demonstrate the ability to disconnect any controller safely from its power source using the AC Power Table. Demonstrate the ability to match wiring labels easily with the control drawings. Demonstrate the ability to locate a controller's location using the BACnet Communication Architecture Schematic and floor plans.

e. Nameplates and Tags:

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1) Show the nameplates and tags are accurate and permanently attached to control panel doors, devices, sensors, and actuators.

G. Workstation and Software Operation

1. For every user workstation or notebook provided:

a. Show points lists agree with naming conventions. b. Show that graphics are complete.

H. BACnet Communications and Interoperability Areas

1. Demonstrate proper interoperability of data sharing, alarm and event management, trending, scheduling, and device and network management.

2. If available or required in this specification, use a BACnet protocol analyzer to assist with identifying devices, viewing network traffic, and verifying interoperability. These requirements must be met even if there is only one manufacturer of equipment installed. Testing includes the following:

a. Data Presentation: On each BACnet Operator Workstation, demonstrate graphic display capabilities.

b. Reading of Any Property: Demonstrate the ability to read and display any used readable object property of any device on the network.

c. Setpoint and Parameter Modifications: Show the ability to modify all setpoints and tuning parameters in the sequence of control or listed on project schedules. Modifications are made with BACnet messages and write services initiated by an operator using workstation graphics, or by completing a field in a menu with instructional text.

d. Peer-to-Peer Data Exchange: Show all BACnet devices are installed and configured to perform BACnet read/write services directly (without the need for operator or workstation intervention), to implement the project sequence of operation, and to share global data.

e. Alarm and Event Management: Show that alarms/events are installed and prioritized according to the DDC SYSTEM Owner.

f. Demonstrate time delays and other logic is set up to avoid nuisance tripping, e.g., no status alarms during unoccupied times or high supply air during cold morning start-up. Show that operators with sufficient privilege can read and write alarm/event parameters for all standard BACnet event types. Show that operators with sufficient privilege can change routing (BACnet notification classes) for each alarm/event including the destination, priority, day of week, time of day, and the type of transition involved (TO-OFF NORMAL, TO-NORMAL, etc.).

g. Schedule Lists: Show that schedules are configured for start/stop, mode change, occupant overrides, and night setback as defined in the sequence of operations.

h. Schedule Display and Modification: Show the ability to display any schedule with start and stop times for the calendar year. Show that all calendar entries and schedules are modifiable from any connected workstation by an operator with sufficient privilege.

i. Archival Storage of Data: Show that data archiving is handled by the operator workstation/server, and local trend archiving and display is accomplished with BACnet Trend Log objects.

j. Modification of Trend Log Object Parameters: Show that an operator with sufficient privilege can change the logged data points, sampling rate, and trend duration.

k. Device and Network Management: Show the following capabilities:

1) Display of Device Status Information 2) Display of BACnet Object Information

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3) Silencing Devices that are Transmitting Erroneous Data 4) Time Synchronization 5) Remote Device Re-initialization 6) Backup and Restore Device Programming and Master Database(s)\ 7) Configuration Management of Half-Routers, Routers and BBMDs

I. Execution of Sequence of Operation: Demonstrate that the HVAC system operates properly through the complete sequence of operation. Use read/write property services to globally read and modify parameters over the internetwork.

J. Control Loop Stability and Accuracy

1. For all control loops tested, give the Engineer trend graphs of the control variable over time, demonstrating that the control loop responds to a 20 percent sudden change of the control variable set point without excessive overshoot and undershoot.

a. If the process does not allow a 20 percent set point change, use the largest change possible. Show that once the new set point is reached, it is stable and maintained.

b. Control loop trend data shall be in real-time with the time between data points 30 seconds or less.

K. Performance Verification Testing Report

1. Upon successful completion of the PVT, submit a PVT Report to the Engineer and prior to the Engineer taking use and possession of the facility. Do not submit the report until all problems are corrected and successfully re-tested.

a. The report shall include the annotated PVT Plan used during the PVT. b. Where problems were identified, explain each problem and the corrective action

taken. Include a written certification that the installation and testing of the control system is complete and meets all of the contract's requirements.

3.7 TRAINING REQUIREMENTS

A. Provide a qualified instructor (or instructors) with two years minimum field experience with the installation and programming of similar BACnet DDC systems.

1. Orient training to the specific systems installed. Coordinate training times with the Owner after receiving approval of the training course documentation. Training shall take place at the job site. A training day shall occur during normal working hours, last no longer than 8 hours and include a one-hour break for lunch and two additional 15-minute breaks.

2. The project's approved Controls System Operators Manual shall be used as the training text.

3. The Contractor shall ensure the manuals are submitted, approved, and available to hand out to the trainees before the start of training.

B. Training Documentation

1. Submit training documentation for review 30 days minimum before training. Documentation shall include an agenda for each training day, objectives, a synopses of each lesson, and the instructor's background and qualifications.

2. The training documentation can be submitted at the same time as the project's Controls System Operators Manual.

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C. Phase I Training - Fundamentals

1. The Phase I training session shall last one day and be conducted in a classroom environment with complete audio-visual aids provided by the contractor.

a. Provide each trainee a printed 8.5 by 11 inch hard-copy of all visual aids used.

2. Upon completion of the Phase I Training, each trainee should fully understand the project's DDC system fundamentals.

3. The training session shall include the following:

a. BACnet fundamentals (objects, services, addressing) and how/where they are used on this project

b. This project's list of control system components c. This project's list of points and objects d. This project's device and network communication architecture e. This project's sequences of control, and: f. Alarm capabilities g. Trending capabilities h. Troubleshooting communication errors i. Troubleshooting hardware errors

D. Phase II Training - Operation

1. Provide Phase II Training shortly after completing Phase I Training. 2. The Phase II training session shall last one day and be conducted at the DDC system

workstation, at a notebook computer connected to the DDC system in the field, and at other site locations as necessary. Upon completion of the Phase II Training, each trainee should fully understand the project's DDC system operation.

3. The training session shall include the following:

a. A walk-through tour of the mechanical system and the installed DDC components (controllers, valves, dampers, surge protection, switches, thermostats, sensors, etc.)

b. A discussion of the components and functions at each DDC panel c. Logging-in and navigating at each operator interface type d. Using each operator interface to find, read, and write to specific controllers and

objects e. Modifying and downloading control program changes f. Modifying setpoints g. Creating, editing, and viewing trends h. Creating, editing, and viewing alarms i. Creating, editing, and viewing operating schedules and schedule objects j. Backing-up and restoring programming and data bases k. Modifying graphic text, backgrounds, dynamic data displays, and links to other

graphics l. Creating new graphics and adding new dynamic data displays and links m. Alarm and Event management n. Adding and removing network devices

E. All training shall be video-taped by the HVAC contractor. Two copies shall be turned over to the Owner’s maintenance staff.

3.8 TREND LOG REQUIREMENTS

A. The DDC System Contractor shall perform data trend logging and reporting for monitoring the performance of the systems and facility through a one-year period commencing on the

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warranty start date. Trend points shall as be established by the Commissioning Agent and A/E. Trend reports shall be provided to the Commissioning Agent and A/E monthly.

3.9 PRESENCE AT THE OSFC ELEVEN-MONTH WALK-THROUGH

A. The DDC System Contractor shall return to the site for the OSFC eleven-month walk-through and review with Commissioning Agent and facility staff the current building operation and the condition of outstanding issues related to the seasonal functional testing performed by the Commissioning Agent, and review trend data and other relevant documentation and reports.

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Documents

UFGS 23 09 23.13 20 BACnet Direct Digital Control · PDF fileDIRECT DIGITAL CONTROL SYSTEMS FOR HVAC . PART 1 ... Valves - Flanged, Threaded and Welding End ASME B16.5 ... Control